A pregnant belly is not hard from the start, but there is a baby in there... with bones. It's not squishy.
And if you're asking if you can maintain the same weight while pregnant... no. You shouldn't. A typical pregnancy requires a weight gain of 25-30 pounds. So if you started your pregnancy with a weight of 120, you should be 145 to 150 right before you deliver. Not gaining enough weight can be VERY dangerous to your baby. It's something like.. up to 5 pounds for the first three months, and a pound a week after that. (Or something very similar.)
I would be frightened for the health of the baby if the mother stayed the same weight until late in the pregnancy instead of a constant, steady weight gain.
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